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Conference on Lasers and Electro-Optics

Monolithically-integrated polarization-entangled photon pair source on a silicon-on-insulator photonic circuit

Hanna Le Jeannic, Nobuyuki Matsuda, Hiroki Takesue, Hiroshi Fukuda, Tai Tsuchizawa, Toshifumi Watanabe, Koji Yamada, Sei-ichi Itabashi, 康弘 都倉

Published Jan 1, 2012• 0 citations
Publisher

Abstract

We present a polarization-entangled photon pair source fully integrated on a silicon photonic circuit. Using two silicon wire waveguides connected with a silicon polarization rotator, we demonstrate a generation of polarization-entangled photons.
DOI
10.1364/qels.2012.qf2f.2

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Integrated photonic circuits are one of the most promising platforms for large-scale photonic quantum information systems due to their small physical size and stable interferometers with near-perfect lateral-mode overlaps. Since many quantum information protocols are based on qubits defined by the polarization of photons, we must develop integrated building blocks to generate, manipulate, and measure the polarization-encoded quantum state on a chip. The generation unit is particularly important. Here we show the first integrated polarization-entangled photon pair source on a chip. We have implemented the source as a simple and stable silicon-on-insulator photonic circuit that generates an entangled state with 91 ± 2% fidelity. The source is equipped with versatile interfaces for silica-on-silicon or other types of waveguide platforms that accommodate the polarization manipulation and projection devices as well as pump light sources. Therefore, we are ready for the full-scale implementation of photonic quantum information systems on a chip.
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